Robert frederick hall



(No Model.)

' R. F. HALL.

DRIVE CHAIN.

No. 554,181. Patented Feb. 4, 1896.

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SPECIFICATION forming part of Letters Patent No. 554,181, dated February4, 1896.

Application filed May 31, 1894. Serial No. 513,070. (No model.) Patentedin England February 1, 1894, No. 2,163, and April 26,1894,No.8,270

T0 aZZ whom it may concern.-

Be it known that I, ROBERT FREDERICK IIALL, manufacturer, a subject ofthe Queen of Great Britain, residing at Sampson Road North, Sparkbrook,in the city of Birmingham, England, have invented certain new and usefulImprovements in Drive-Chains and I do hereby declare the following to bea full, clear, and exact description of the invention, reference beinghad to the accompanying drawings, which form part of this specification,for which invention Letters Patent of Great Britain have been granted tome bearing date, respectively, the 1st day of February,189 1, No. 2,163,and the 26th day of April, 1894, No. 8,270.

My invention relates to improvements in driving-chains for cycles andmachinery.

Figure 1 of the accompanying drawings represents in side elevation alength of cycle drive-chain, made according to my invention. Fig. 2represents a top side plan of Fig. 1. Fig. 3 represents averticalsection of the said chain, showing the knife-edged pins or rivets insection and the pitch -bars of alternate links in elevation. Fig.irepresents a horizontal section of a portion of a chain upon the dottedlines a: 00, Fig. 1. Fig. 5 represents a transverse section of the chainupon the dotted line A B, Fig. 4, looking toward the knifeedge of therivet. Fig. 6 represents a trans verse section of the chain upon thedotted line 0 D, Fig. 3. Fig. 7 represents a longitudinal section of thewhole of the component parts of two alternate and one intermediatelinks. Fig. 8 represents a side elevation of an intermediate link, andFig. 9 is a side elevation of an alternate link.

In Figs. 1 to 9, a are alternate links, and b are intermediate links,the one connected to the other, so as to make up a length of chain by orthrough the medium of knife-edged cross pins or rivets 0. Each of thealternate links a is preferably made up of a series of cut-outsheet-metal link-shaped plates at, placed face to face and with the endpiercings a of their cut-out middle parts,a ,formed V or wedge shaped ata within which wedge ends the presented knife-edges c of the pins orrivets 0, carried by the intermediate links, I), take their bearing. Thecut-out middle parts, a have pitch-bars a for confining or keeping snugthe knife-edged rivets, whereby backlash is prevented.

Each of the intermediate links, Z), consists of two side plates orcheeks, I), kept parallel and separated from each other to a givendistanee (so as to form the tooth-spaces d) by the end inside faces ofthem coming upon the end outside faces of the alternate links, and thewhole are joined up by the cross pins or rivets 0, whose ends areexpanded into heads 0 The middles of the side plates, Z), of the linksI) have piloting-horns or tooth-finders b which show the way to orconduct or guide the spaces 6 of thelinks of the chain over the teeth bythe said piloting-horns having their tips Z9 inclined slightly outward,whereby the said finders feel the tips of the teeth in advance of thelinks themselves and the spaces between them, and whereby the said linksare prevented from striking and riding upon the said teeth, and are somade to travel uniformly and evenly over the chain-wheels.

Referring back to the alternate links a, it is understood that the samemay be made either from a series of thin metal plates or solid, and ifnecessary, without the backlashbars, and that the points a of theV-shaped ends constitute confined bearings for the knife-edges of thepins or rivets, and that the inclined sides a form bearin g finders orguides for guiding and keeping the said knife-edges up to the saidpoints a when the chain is drawn taut.

d is a joining-up link (represented on the ends of the lengths of chain,Figs. 1, 2 and 3) consisting of a loop-sh aped body part (1, with amiddle piercing, d having tapering ends (1 converging outwardly toconfined bearing ends or points (Z alike unto the other links of thechain. 1

One side of the body part is split or divided and has flanges or lugs dwhich are drawn together by a screw-pin d passing through screwed andplain holes (Z (1 made through the said lugs or flanges.

When the screw-pin is removed, the gap or space d located between theflanges d 01 springs open and leaves a space between them of a breadthsufficient for the passing therethrough of the end cross rivets or pins0 of the end links. Thus, in making a continuous chain, pass the endcross pins or rivets c of the end links, Z), of a length of chain, asshown, through the gap (1, then pass the screw-pin d through the holesin the flanges (Z and screw up the pin, when the said-flanges are drawntogether and the loose ends of the chain united or coupled.

Instead of the flanges of the joining-up link being connected togetherand drawn up by a screw-pin a cross-rivet may be used in lieu of thesaid screw-pin.

Ilavin g fully described my invention, what ROBERT FREDERICK HALL.

IVitnesses:

' HENRYSKERRETT,

WILLIAM H. LONG.

